Event-triggered load frequency control for power system based on dynamic quantization

doi:10.3785/j.issn.1008-973X.2023.07.021

Journal of ZheJiang University (Engineering Science)

2023, Vol. 57

Issue (7): 1460-1469 DOI: 10.3785/j.issn.1008-973X.2023.07.021

Event-triggered load frequency control for power system based on dynamic quantization

San-bo DING1(

),Kang ZHANG1,Fei-sheng YANG2,Jia-an ZHANG3

1. College of Artificial Intelligence and Data Science, Hebei University of Technology, Tianjin 300401, China
2. School of Automation, Northwestern Polytechnical University, Xi’an 710072, China
3. College of Electrical Engineering, Hebei University of Technology, Tianjin 300401, China

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Abstract

The dynamic quantization technology was introduced into the network-controlled power system and the event-triggered load frequency control (LFC) method was applied to save the network resources aiming at the high proportion of new energy connected to the grid and the increasing communication load of secondary frequency modulation. The input-to-state stability of LFC system was realized by observer-based output feedback controller. An event-triggered mechanism with exponential decay term was designed for the feedback channel, and an event-triggered mechanism with state simulation term was designed for the forward channel according to the system state and dynamic quantization parameters. A dynamic model of event-triggered LFC system based on quantization communication was established. The condition of closed-loop system input-to-state stability was obtained under the bounded load disturbance. Zeno phenomenon was eliminated. The effectiveness of the proposed method was verified by simulation.

Key words： network-controlled system load frequency control event-triggered load dynamic quantization input-to-state stability

Received: 23 July 2022 Published: 17 July 2023

CLC:

TP 13

Fund: 国家自然科学基金资助项目（61903121，62073269）；河北省自然科学基金资助项目（F2020202063）；河北省创新能力提升计划资助项目（18961604H）；航空科学基金资助项目（2020Z0340-53002）；陕西省重点研发计划资助项目（2022GY-244）

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Cite this article:

San-bo DING,Kang ZHANG,Fei-sheng YANG,Jia-an ZHANG. Event-triggered load frequency control for power system based on dynamic quantization. Journal of ZheJiang University (Engineering Science), 2023, 57(7): 1460-1469.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.07.021 OR https://www.zjujournals.com/eng/Y2023/V57/I7/1460

基于动态量化的电力系统事件触发负荷频率控制

针对新能源高比例并网以及由此产生的二次调频通信负荷增加问题，为了节约网络资源，将动态量化技术引入网络控制的电力系统中，应用事件触发负荷频率控制(LFC)方法，通过基于观测器的输出反馈控制器，实现了LFC系统输入到状态稳定. 根据系统状态和动态量化参数，在反馈通道中设计加入指数衰减项的事件触发机制，在前向通道中设计加入状态模拟项的事件触发机制. 建立基于量化控制的事件触发LFC系统动态模型，在有界负荷扰动下得到闭环系统输入到状态稳定的条件，排除了Zeno现象. 通过仿真实验验证了提出方法的有效性.

关键词： 网络控制系统, 负荷频率控制, 事件触发负荷, 动态量化, 输入到状态稳定

Fig.1 Dynamic model of one-area load frequency control system

Fig.2 Dynamic model of load frequency control system based on quantization control

Tab.1 Parameters of load frequency control system

Fig.3 Response curve of system frequency deviation

Fig.4 Response curve of system state

Fig.5 Response curve of observer state

Fig.6 Response curve of state estimation error

Fig.7 Response curve of output signal and output quantizer

Fig.8 Response curve of input signal and input quantizer

Fig.9 Response curve of zooming variables

Fig.10 Response curve of system frequency deviation^[22]

Fig.11 Event triggering intervals based on proposed method

Fig.12 Event triggering intervals^[22]


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